<template>
 <div>
   <!--    面包屑导航区域-->
   <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>添加商品</el-breadcrumb-item>
   </el-breadcrumb>
<!--   卡片-->
   <el-card>
    <!--   提示区域  -->
     <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!--  步骤区域   -->
     <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
       <el-step title="基本信息"></el-step>
       <el-step title="商品参数"></el-step>
       <el-step title="商品属性"></el-step>
       <el-step title="商品图片"></el-step>
       <el-step title="商品内容"></el-step>
       <el-step title="完成"></el-step>
     </el-steps>
     <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
              label-width="100px" label-position="top"  >
       <el-tabs :tab-position="'left'" v-model="activeIndex"
                :before-leave="beforeTableave" @tab-click="TabClicked">
         <el-tab-pane label="基本信息" name="0">
           <el-form-item label="商品名称" prop="goods_name">
             <el-input v-model="addForm.goods_name"></el-input>
           </el-form-item>
           <el-form-item label="商品价格" prop="goods_price">
             <el-input v-model="addForm.goods_price" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品重量" prop="goods_weight">
             <el-input v-model="addForm.goods_weight" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品数量" prop="goods_number">
             <el-input v-model="addForm.goods_number" type="number"></el-input>
           </el-form-item>
           <el-form-item label="商品分类" prop="goods_cat">
             <el-cascader
               v-model="addForm.goods_cat"
               :options="catelist"
               :props='cateProps'
               @change="handleChange"></el-cascader>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品参数" name="1">
           <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                          :key="item.attr_id">
             <el-checkbox-group v-model="item.attr_vals">
               <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"
                            border></el-checkbox>
             </el-checkbox-group>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品属性" name="2">
           <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
             <el-input v-model="item.attr_vals"></el-input>
           </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品图片" name="3">
           <el-upload
             action="http://127.0.0.1:8888/api/private/v1/upload"
             :on-preview="handlePreview"
             :on-remove="handleRemove"
             list-type="picture"
             :headers="headerObj"
             :on-success="handleSuccess">
             <el-button size="small" type="primary">点击上传</el-button>
             <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
           </el-upload>
         </el-tab-pane>
         <el-tab-pane label="商品内容" name="4">
           <quill-editor v-model="addForm.goods_introduce"></quill-editor>
           <el-button type="primary" class="BtnAdd" @click="add">添加商品</el-button>
         </el-tab-pane>
       </el-tabs>
     </el-form>
   </el-card>
<!--   图片预览对话框-->
   <el-dialog
     title="图片预览"
     :visible.sync="previewVisible"
     width="50%">
    <img :src="previewPath" alt="" class="previewImg">
   </el-dialog>
 </div>
</template>

<script>
// 在页面中导入lodash插件
import _ from 'lodash'
export default {
  name: 'addgoods',
  data() {
    return {
      // 1.保存步骤区域被激活步骤的index。默认为0
      activeIndex: '0',
      // 2.自定义表单相关属性
      // 2.1 添加商品表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [], // 商品所属分类数组
        pics: [], // 图片的数组
        goods_introduce: '', // 商品的详情描述
        attrs: []
      },
      // 2.2 添加商品表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 2.3 保存商品分类数据列表的数组
      catelist: [],
      // 2.4 定义级联选择器中props绑定的对象配置
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        expandTrigger: 'hover',
        children: 'children'
      },
      // 2.5 保存动态参数数据的数组
      manyTableData: [],
      // 2.6 保存静态属性数据的数组
      onlyTableData: [],
      // 2.7图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 2.8保存图片的URL路径
      previewPath: '',
      // 2.9控制图片预览对话框的显示和隐藏
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    // 1.获取三级分类商品的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  },
  methods: {
    // 2.获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      } else {
        this.catelist = res.data
        console.log(this.catelist)
      }
    },
    // 2.1 级联选择器选中项变化时触发的函数
    handleChange() {
      // console.log(this.addForm.goods_cat)
      // 判断goods_cat的长度是否为3来实现只能选择三级商品分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 2.2 阻止标签页的切换
    beforeTableave(activeName, oldActiveName) {
      /* console.log(oldActiveName)
      console.log(activeName) */
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // 2.3 获取分类动态参数列表和静态属性列表的数据
    async TabClicked() {
      // 获取动态参数列表数据
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        } else {
          // 将获取到的data对象转换成一个数组
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
          console.log(this.manyTableData)
        }
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        } else {
          console.log(res.data)
          this.onlyTableData = res.data
        }
      }
    },
    // 2.4处理图片预览效果的操作
    handlePreview(file) {
      console.log(file)
      // 1. 获取图片的URL路径
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 2.5处理移除图片的操作
    handleRemove(file) {
      // 1.获取将要移除图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中找到该图片对应的索引值
      const i = this.addForm.pics.findIndex(x =>
        // 找到对应图片的判断依据
        x.pic === filePath
      )
      // 3.调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 2.6监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 2.7 添加商品的操作
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        } else {
          // 使用lodash插件中是深拷贝addForm并且保存在form中
          const form = _.cloneDeep(this.addForm)
          // 使用join方法将form数组转化为字符串
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数：使用forEach变量manyTableDate数组
          // 取出item中的attr_id和attr_vals以名值对的信形式保存在newInfo
          // attr_vals是一个数组，因此使用join来转换为字符串
          // 使用push方法添加到addForm中的attrs数组中
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
            console.log(this.addForm)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
            console.log(this.addForm)
          })
          form.attrs = this.addForm.attrs
          console.log(form)
          // 发起请求添加商品
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          } else {
            this.$message.success('添加商品成功！')
            await this.$router.push('/goods')
          }
        }
      })
    }
  }
}
</script>

<style scoped>
.el-checkbox{
  margin: 0 10px 0 0!important;
}
.previewImg {
  width: 100%;
}
.BtnAdd{
  margin-top: 15px;
}
</style>
